Conveyor belt tightener



FIG. 1 is a perspective view of a conveyor belt tightener showing my design, showing the tightener from its bottom, rear, and right sides;

FIG. 2 is another perspective view of the tightener showing my design, showing the tightener from its top, front, and right sides;

FIG. 3 is a top plan view of the tightener;

FIG. 4 is an elevational view of the left side of the tightener;

FIG. 5 is a bottom plan view of the tightener;

FIG. 6 is an elevational view of the right side of the tightener;

FIG. 7 is an elevational view of the rear end of the tightener; and,

FIG. 8 is an elevational view of the front end of the tightener. 

CLAIM The ornamental design for a conveyor belt tightener, as shown and described. 